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Encyclopedia Britannica - Main :: RON-SAC |
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ROOD (O.E. rod, a stick, another form of " rod, O.E. rodd, possibly cognate with Lat. rudis, a staff) , properly a rod or pole, and so used as the name of a surface measure of land. The rood varies locally but is generally taken as = 4o square rods, poles or perches; 4 roods=1 acre. The term was, however, particularly applied, in O.E., to a gallows or cross, especially to the Holy Cross on which Christ was crucified, the sense in which the word survives. A crucifix, often accompanied by figures of St John and the Virgin Mary, was usually placed in churches above the screen, hence known as " rood screen " C (see SCREEN), which divides the chancel or the choir from the nave
wall
work
nave
The simplest form is the " flat roof " consisting of horizontal
wood
wall
i joists are covered with a waterproof material such as asphalt, 1 lead, zinc or copper, the three last materials being usually laid upon boarding, which stiffens the structure and forms a good surface to fix the weatherproof covering upon. Such roofs are not suitable for cold climates, for accumulations of snow might overburden the structure and would also cause the wet to penetrate through any small crevices and under flashings. With flat roofs the pressure exerted upon the supports is directly vertical. " Lean-to," " shed," or " pent " roofs are practically developments of the flat roof, one end of the joists (which are now called " rafters ") being tipped up to form a decided slope, which enables slates, tiles, corrugated iron and other materials to be employed which cannot be used upon a " flat " roof. Simple roofs in general use with a double
horizontal
ridge
ridge
plate
Forms of roof. End of Article: ROOD (O.E. rod, a stick, another form of " rod, O.E. rodd, possibly cognate with Lat. rudis, a staff) If you wish, you can link directly to this article.
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